Exchange 2003 will not pass mail to new Exchange 2003 server

Have recently introduced another Exchange 2003 server on same domain as existing Exchange 2003 server. After moving a test mailbox to new server the mailbox can send but not receive mails.

Have run telnet to and from both servers via IP, host name and hostname.domainname , all work successfully. Removed Smarthost from Virtual Server, stopped and restarted the virtual server. Issue still remains.

Can telnet to new server via it's nat'd public IP and run raw SMTP commands i.e send from: rcpt to: etc, mail arrives in mailbox successfully. Think it is something to do with the new server not accepting mail from the original server.

What does message tracking say?
That will show you what Exchange is doing with the email.

The most common reason for email not being delivered is a smart host on the SMTP virtual server. The second most common reason is badly configured antivirus software which either blocks the messages or quarantines them.

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